Probe Does Not Give Accurate Indication Of Applied Test Gas; Probe Heater Temperature Unstable - Emerson Rosemount Oxymitter DR Reference Manual

Reference Manual
00809-0100-4884
Potential cause
Electronics failure
Recommended actions
5.4 Probe does not give accurate indication of
applied test gas
Potential cause
Blocked port
Recommended actions
Potential cause
Diffusion element cracked, broken, or missing
Recommended actions
5.5

Probe heater temperature unstable

Potential cause
Wrong heater
Recommended actions
Rosemount Oxymitter DR
1. Check cell mV input to electronics.
2. Check electronics package.
1. Check test gas input port.
2. Clean port.
3. If the flue gas is condensing in the test gas line, insulate the back of the probe.
4. Make sure that the test gas line is capped between calibrations or a check valve
is installed.
1. Check ceramic diffusion element.
2. Replace diffusion element.
1. Check to see if the proper voltage heater is installed.
2. Change heater to proper voltage.
Troubleshoot
April 2022
61